Android控件之ListView探究二，带CheckBox的ListView

布局用的是RelativeLayout这种布局方式，要指定位置，不太好，以后如果有其它好的方式再修改

main.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="horizontal" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
	<ListView android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:id="@+id/MyListView">
	</ListView>
</LinearLayout>

list_items.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="wrap_content" android:id="@+id/myListItem"
	android:paddingBottom="5dip" android:paddingLeft="12dip"
	android:paddingRight="12dip">
	<ImageView android:id="@+id/img" android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:layout_alignParentLeft="true"></ImageView>
	<TextView android:layout_height="wrap_content"
		android:layout_width="wrap_content" android:id="@+id/itemTitle"
		android:textSize="20dip" android:paddingTop="15px"
		android:layout_marginLeft="70px">
	</TextView>
	<CheckBox android:id="@+id/cb" android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:layout_alignParentRight="true"
		android:focusable="false"></CheckBox>
</RelativeLayout>

MyList.java类:

package iaiai.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnCreateContextMenuListener;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

public class MyList extends Activity {

	private ListView list;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		list = (ListView) findViewById(R.id.MyListView);

		// 配置适配器
		MyCheckBoxAdapter adapter = new MyCheckBoxAdapter(this,getData()); // 布局里的控件id
		// 添加并且显示
		list.setAdapter(adapter);

		// 添加点击
		list.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
				setTitle("点击第" + arg2 + "个项目");
				Toast.makeText(MyList.this, "点击第" + arg2 + "个项目",
						Toast.LENGTH_LONG).show();
			}
		});

		// 添加长按点击
		list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
			@Override
			public void onCreateContextMenu(ContextMenu menu, View v,
					ContextMenuInfo menuInfo) {
				// menu.setHeaderIcon(R.drawable.icon); //字义图片样式
				menu.setHeaderTitle("长按菜单选项:");
				menu.add(1, 0, 0, "编辑");
				menu.add(0, 1, 0, "删除");
			}
		});
	}

	@Override
	public boolean onContextItemSelected(MenuItem item) {
		int selectedPosition = ((AdapterContextMenuInfo) item.getMenuInfo()).position; // 刚才选择的
		Map<String, String> map = (HashMap) list
				.getItemAtPosition(selectedPosition); // ListView中的数据
		Toast.makeText(MyList.this,
				"你选择的:" + selectedPosition + "，内容为:" + map.get("itemTitle"),
				Toast.LENGTH_LONG).show(); // 显示那条数据

		String temp = "";
		switch (item.getItemId()) {
		case 0:
			temp = "编辑";
			break;
		case 1:
			temp = "删除";
			break;
		default:
			break;
		}
		// Toast.makeText(this, temp + "處理", Toast.LENGTH_LONG).show();
		return super.onContextItemSelected(item);
	}

	private List<Map<String, String>> getData() {
		// 组织数据源
		List<Map<String, String>> mylist = new ArrayList<Map<String, String>>();
		for (int i = 0; i < 10; i++) {
			Map<String, String> map = new HashMap<String, String>();
			map.put("" + i, i + "");
			map.put("itemTitle", "文章" + i);
			mylist.add(map);
		}
		return mylist;
	}

	/**
	 * listview中点击按键弹出对话框
	 */
	public void showInfo() {
		new AlertDialog.Builder(this).setTitle("我的listview")
				.setMessage("介绍...")
				.setPositiveButton("确定", new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
					}
				}).show();
	}
}

MyCheckBoxAdapter.java类:

package iaiai.test;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MyCheckBoxAdapter extends BaseAdapter {

	private LayoutInflater mInflater;

	private List<Map<String, String>> listData;

	private Map<Integer, Map<String, String>> selectMap = new HashMap<Integer, Map<String, String>>();

	private class ViewHolder {
		public ImageView img;
		public TextView title;
		public CheckBox checkBox;
	}

	public MyCheckBoxAdapter(Context context, List<Map<String, String>> listData) {
		this.mInflater = LayoutInflater.from(context);
		this.listData = listData;
	}

	@Override
	public int getCount() {
		return listData.size();
	}

	@Override
	public Object getItem(int position) {
		return listData.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(final int position, View convertView, ViewGroup parent) {
		ViewHolder holder = null;
		if (convertView == null) {
			holder = new ViewHolder();
			convertView = mInflater.inflate(R.layout.list_items, null);
			final View view = convertView;
			holder.img = (ImageView) convertView.findViewById(R.id.img);
			holder.title = (TextView) convertView.findViewById(R.id.itemTitle);
			holder.checkBox = (CheckBox) convertView.findViewById(R.id.cb);
			holder.checkBox.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					if (selectMap.get(position) != null) {
						selectMap.remove(position);
					} else {
						selectMap.put(position, listData.get(position));
					}
					Toast.makeText(view.getContext(),
							"你选择了:" + selectMap.size() + "个.",
							Toast.LENGTH_LONG).show();
				}
			});
			convertView.setTag(holder);
		} else {
			holder = (ViewHolder) convertView.getTag();
		}

		holder.img.setBackgroundResource(R.drawable.icon);
		holder.title.setText(listData.get(position).get("itemTitle"));

		if (selectMap.get(position) != null) {
			holder.checkBox.setChecked(true);
		} else {
			holder.checkBox.setChecked(false);
		}

		return convertView;
	}
}

这篇文章主要是学习BaseAdapter类的使用，发的文章都是经过运行可以跑起来的，并且代码全会发到上面。

下面是运行结果:

评论

1 楼 cwc455826074 2012-05-08  

昂 感谢分享